合金元素與鐵、碳的相互作用

合金元素加入鋼中后，主要以三種形式存在鋼中。即：與鐵形成固溶體；與碳形成碳化物；在高合金鋼中還可能形成金屬間化合物。

The interaction of alloying elements with iron and carbon

When alloy elements are added to steel, they mainly exist in three forms. Namely: to form a solid solution with iron; carbide and carbon; in high alloy steels are also likely to form intermetallic compounds.

①膠合板有正反面的區(qū)別。挑選時，膠合板要木紋清晰，正面光潔平滑，不毛糙，要平整無滯手感。

②膠合板不應(yīng)有破損、碰傷、硬傷、疤節(jié)等疵點(diǎn)。

1.the difference between the plywood and the  and negative sides. When selecting, plywood should be clear, smooth, smooth, and smooth.

2. Plywood should not be damaged, bruised, hard or scarred.